c# Checkedlistbox Multicolumn

I have a checkedlistbox control in C#.

I want to know who to add multicolumns to it. The multicolumn property is set to true. I just want to know the coding to add 2 columns.

The code i have is

 while (true)
        {
            data = SDK.GetNext("ACCHISTL", 6);
            document_details = data.Split('|');
            if (document_details[0] == "0")
            {
                if (document_details[3] == Document_nr)
                {
                    lbLines.Items.su(document_details[4] + " -> " + document_details[14],true);
                }
                else
                {
                    break;
                }
            }
            else
            {
                break;
            }
        }

Can you please assist me on show me the correct way of doing this?